Stencil-duplicating apparatus.



- No. 862,452.. PATENTED AUG. 6, 1907.

A. B. DICK.

STENCIL DUPLIGATING APPARATUS. APPLICATION FILED JAN. a. 1905.

v 2 SHEETS-SHEET 1.

WITNESSES:

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WW J BY ATTORNEY No. 862,452.' PATENTED. AUG. 6,. 1907..

' A. B. 1110K. STBNGIL DUPLIGATING APPARATUS. APPLIOATIQH FILED JAN. 3. 1905.

2 SHEETSBHEE WHTNESSES): INVENTOR 48% W BY fig? ATTORNEY 'UNITED STATES PATENT OFFICE- -ALBER'l B. DICK, OF LAKE FOREST, ILLINOIS, ASSIGNOR TO A. B. DICK COMPANY, OF CHICAGO, ILLINOIS, A-CORPORATION .OF IL INOIs.

STENCIL-DUPLIGATING APPARATUS.

' Specification of Letters Patent.

Patented Aug. 6, 1907.

Application filed January 3,1905. stas s. 239,413.

To all whom it may concem:

Be it known that I, ALBERT B. DICK, a citizen of'the United States, residing at Lake Forest, in the county of Lake and State of Illinois, have invented a certain new and useful Improvement in Stencil-Duplicating Apparatus, of which the following is a specification.

The invention concerns more particularly the sheetdelivery mechanism of apparatus for stencil-duplication and will be described herein in connection with such apparatus, although it is obvious that the same may be employed to equal advantage in printing, folding and other mechanisms. Adifiiculty heretofore experienced in' devices of this general character has been the failure of the sheets to pass evenly irolnthe mechanism and deposit themselves ina pile in a suitable receiving tray or other device, This has been due in large measure to the lack of mechanical provision for advancing the sheets from the mechanism, as

well as to the fact that during the operation of imprinting upon or otherwise treating the sheet the same he'- comes electrically charged, due to which the sheets as fed irom the mechanism cling together or to metallic parts either of such mechanism or of the receiving tray or other device in which such sheets are to be stacked or piled.

In carrying out the invention in an approved form A and in a stencil-duplicating apparatus of the general type, for example, shown in Letters Patent Nos. 749,983 and 749,984, granted to me January 19th, 1904, I employ, adjacent to the stencil-carrying drum by means whereof the sheets are imprinted upon, but

rearward thereof, a guiding and delivering device,

which, mechanically considered, receives the sheets from the stencil-carrying drum and passes the same evenly and in the proper plane and direction to any suitable receiver, as for instance a paper-tray, and which, electrically considered, causes the discharge or neutralization of the electricity with-which the sheets have been charged during their passage in contact with said drum or with the feeding apparatus whereby the same are fed to such drum.

The invention is illustrated in the accompanying drawings, in which i i Figure 1 is an end view of a sienci1-duplicating apparatus provided with my invention, and Fig. 2 is a cross-section on the line 2-2 Fig. 1, certain unimportant parts being Omitted for clearness of disclosure.

Referring to these drawings, in which similar letters denote corresponding parts, it will be seen that the supporting frame of the apparatus includes the two side members A, A, in which is supported, by means of shaft a, the drum B, having a foraminated exterior upon which the stencil-sheetis supported. Said drum may be operated by any suitable means, as for instance hand'as illustrated in said Letters Patent No.

rectly underlying the drum B, is the usual pressureroller 0, and adjacent to the point of coaction between said pressure-roller and said drum is, in the present example, a combined paper-stop and -stripper D, the construction and operatiori whereof will readily be understood from said Letters *Patent NO. 749,983. The sheets are fed from the right (Fig. 2) between the pressureroller G and the drum B and against the paperstop D, and when the stencilrcarrying portion of.sai d drum comes into coaction therewith the sheets are imprinted upon and simultaneously fed from between said roller and drum rearward of the machine to any suitablecoritainer, such as a paper-tray: The mechanism thus far described forms no part of the present invention. l i

In Letters Patent Nos. 746,930 and 749,983, heretofore granted to me, means areshown for feeding a sheet from a stencil-duplicating machine in such manner as that the longitudinal center thereof is depressed and feeding by preventing the sheets from rolling upon themselves. Such means in each case comprise a inember having fixed elevated plortions coacting with the lateral edges Of the sheet. In the present invention, the same result is accomplished, plus a rearward feed of the sheet, in the following manner:

E designates a shaft extending between and journaled in the side members A, A, of the frame. One end thereof extends through said frame and is provided, in the present instance, with a pulley e, with which coacts a belt e which may be driven by a pulley e to which power may be transmitted in any suitable manner. Said shaft E is provided with two spur-wheels e keyed or otherwise secured thereon, their peripheries bi:- ing provided with teeth or serrations. Said spur-wheels are so spaced apart as that the same will coact with a sheet near the lateral edges of the latter, permitting the longitudinal center of the sheet to be depressed and thereby curving it in such manner as to preclude the objectionable rolling or folding above referred to. Also and for the purpose hereinafter referred to, said spurwheels and the shaft uponv which they are mounted are, like the side members A, A of the frame, of metal or other conducting material.

F designates a rod extending between and connected with the side members A, A, of the frame. Detachably secured to this rod, as for instance by means of screws f, is a sheet-guard G, here shown as extending downwardly toward the shaft E and spur-wheels e, and provided at its extremity with a star-wheel g. The under side of said sheet-guard is inclined, as shown at g, for better coaction with the sheet. As will be seen,

' said paper-guard is preferably arranged about midway 7 action of the sheet-guard G therewith In this form,

' sheet-feeding apparatus, such for instance as that decharged from the apparatus without dissipating the.

tions in' atmospheric conditions. In' the present invenbetweenthe spur-wheels e the star-wheel in the ex- -m0st) asto preclude the streaking of'the ink characters -Said shaftand spur-wheels may either be stationary or tremity thereof being adapted to' make such contact with the passing sheet (whose printed surface is upperthereon. Preferably said sheet-guard G and its supporting rod F will, like the partsabove referred to, be of metal or other conducting material. I

H designates a block, of wood or other suitable material, bridging the space between thelpressure-roller O and the shaft E and its spur-wheels e and having an inclined surface in order that the sheet may readily slide thereon. I

In operation, a sheet whichis being imprinted upon by the stencil-carrying drum is simultaneously fed from between said drum and the pressure-roller, whereupon the forward edge thereof is passed downwardly and over the inclined surface of the block H, and thence over the spur-wheels e The longitudinal center of such sheet, as above describe-7d, is bowed downwardly between said spur-wheels, and this is made doubly sure by the cothe sheet is fedsmoothly and continuously from the mechanism and discharged into the pap'er-tray'or other, device. It may not be absolutely essential that the shaft'and spur-wheels E and e be employed, although the same conduce to perfect discharge of the sheets.

free to revolve under the movement of the sheet, which is pressed rearwardly, as above explained, by the coaction of the drurnB and the pressure-roller C. Or, if

desired, the other features of the invention herein disclosed may be realized if for such shaft and spur-wheels there be substituted the means shown, for example, in said'Letters Patent No. 746,930.

During the operation of-imprinting upon the sheet," the friction of the pressure-roller and stencil'carrying drum upon the opposite sides thereof (and where a scribed in said Letters Patent No. 749,984, is employ ed, the effect is the same) is such that said ppposite sides of the sheet are charged with electricity of opposite polarity, and if attempt be made to deliver the sheet so charge in some manner,-the difliculty above referred to will be experienced, this varying in degree with variation, such difficulty is overcome by passing the, sheet so charged between metallic parts, which if electrically charged at all are of the same polarity, whereby the sheet, I have had .in mind, for'illustration, the use of a sheet bf greater length than width, as for instance, a sheet of letter-size. It will" be obvious, however, that if the sheet be of greater width than length, the word 10ngitudinal should be applied to that dimension of the sheet which extends in the line of its delivery.

Having now described my invention, what I claim as new therein and desire to'secure by Letters Patent is as followszv 1. In sheet-delivery mechanism for stencil-duplicating and like apparatus, the combination with means for" imprinting'upon and forwarding a sheet, of two electrically connected metallic parts, one engaging said sheet on one side at points adjacent to the lateraledges and the other engaging the sheet on the opposite side near the longitudlnal center thereof, said parts being'arranged' to 'give the sheet a transverse curvature in passing between them,

substantially as described.

2: In a sheet-delivery mechanism for stencil-duplicating and like apparatus, the combination with means for imprinting upon and forwarding a sheet, of two electricallyconnected metallic parts adapted to engage opposite sides of each sheet ask is forwarded by said means, one of said parts being a pair of supports coactlng with one side of each sheet at points adjacent to the edges thereof and the other of said partscoacting with the other side ,of said sheet near the longitudinalcenter' thereof, substantially as described.

3. In sheet-delivery mechanism for stencil-duplicating and like apparatus, the combination with means foracting upon and forwarding a sheet, of means for curving said sheet between its lateral edges,.and a sheet-guard overlyingsuch. sheetand having an inclined portlonJcoacting therewith at about the longitudinal center thereof, snb-- stantially as set forth. I

4. In sheet-delivery mechanism for stencil-duplicating and like apparatus, the combination with means for acting upon and forwarding a sheet, of means in receiving. said sheet and curving the same between its lateral edges, and an overlying sheet-guard having a star-wheel and an in-' cllned surface coacting with said sheet at about the longis tudlnal center thereof, substantially asset forth.

December, 1904.

Witnesses I M. H. BtmKAn'r,

R.- R. HARBINGTOPLV ALBERT B. DICK. 

